Window cleaners work on the outside of a new building in Bangkok, Thailand, on December 23. Thailand's economy is expected to grow 3.3 per cent in 2016 and 3.4 per cent in 2017, driven by the government's investment in infrastructure projects as well as tourism, as the numbers of visitors to the country increases following the nationwide official mourning period for the late Thai King Bhumibol Adulyadej.-epa